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    By adding \sisetup{output-exponent-marker=\ensuremath{\mathrm{e}}} to the preamble, one gets 1e-10 in the required way. Commented Sep 27, 2015 at 22:19
  • @erik that looks very nice, but what I really want to know is if there's a way to format the e-style notation nicely. Knowing how to do the alternative 1x10^-10 style doesn't really help me. Any ideas? Commented Sep 27, 2015 at 22:29
  • @tel I see. I didn't realize you specifically wanted to keep the 'e' notation. egreg's comment (and answer) offer an alternative, but the typesetting may not be what you want. Commented Sep 27, 2015 at 22:37
  • 2 x 10^3 is nice, but 1 x 10^3 is verbose compared to just 10^3. To get that, use the nonintuitive invocation \num{e3}. Commented Nov 15, 2018 at 20:10
  • Man this looks so beautiful. I love LaTeX, even after being out of uni for years. :) Commented Mar 15, 2020 at 11:35